RESUMEN
Few studies have investigated corporate political activity by unhealthy commodity industries in low- and middle-income countries, and the significance of social and political context has been largely neglected. This study aimed to explore the stalled development of marketing restriction policies in Brazil with an analysis of strategies used to undermine the Legal Framework for Early Childhood. Using a constructivist approach based on a typology of corporate political strategies, decision-making processes were assessed to understand interference by food companies in the Legal Framework, and how this was perceived by policy actors. Semi-structured interviews were conducted with public health advocates, academics and legislature officials. Three broad strategies that contributed to the stalling of marketing restrictions in the Legal Framework were identified: relational approaches to policy influence; collective participation in formal decision-making; and specific strategy choices (information and financial incentives). Key opportunities for policy influence through informal social networks in the 'backstage' of policy making are found to privilege commercial sector actors. Informal policy making may have a critical function in obstructing the development of health-focused regulation in Brazil. This highlights the need for a better understanding of non-codified and hidden corporate efforts to shape the policy environment.